Sewing machine



May 3, 193 N. v. CHRISTENSEN ET AL SEWING MACHINE Filed pril 14. 1926 5Sheets-Sheet, l

mute 0S Y MM May 3, 1932. N. v. CHRISTENSEN r'r AL 7,

SEWING MACHINE Filed April 14, 1926 s Sheets-Sheet 2 y 1932- N. vCHRISTENSEN ET AL 1,357,041

SEWING MACHINE Filed April 14. 1926 5 Sheets-Sheet 5 Patented May 3,1932 3 UNITED? s'r r-Es nommiv v. onnrs'rmvsniv WALTER M. nAnNEAn-orcmcAGo LLrNois, As- SIGNOR-S TO umonsrncmt MACHINE eomrnnm orcnIcAeo rumors, A con- POBATION or ILLINOIS snwme Macar ni; i

Application filedApril '14,

The invention'relates'to new and useful improvements in sewing machlnes,and more particularly to a'sewing machine, having a" cylindrical worksupporting arm on which tubular .articlesare stltched.

An object of'the invention is to provide a sewing machine of theabovetype having a four-motion feed dog and a four-motion looper, withactuatmg devlces therefor wherein all of the movements imparted to thefeed dog and the looper are der ved from two eccentrlcs and a crank onthe mam shaft.

A further object of the inventionis to wherein the parts actuated by theeccentrics and the crank may be detached therefrom, after which theentire worksupporting arm with the remainder of the feedinglm echanismand looper mechanism assembledthere- I T in may be removed, and .adifferent arm with a feeding mechanism including a differential feed dogand a looper mechanism substituted therefor. V v I A further object ofthe invention is'to pro-f vide a sewing machine of the above typewherein the feeding mechanism includes de vices wherein the feed dog maybe leveled or tilted as desired, or the Working position thereof ralsedandlowered.

.A still further obgect of the invention is to provide a'sewing machineof the above type 1 wherein the feed bar is supported at the rear endthereof by two independent rocking arms,

one at each side thereof, which rocking arms are positively connected soas to maintain the work supporting arm and the parts of the frame onwhich said arm is mounterhare provided with suitably covered openingsthrough which access maybe readily had tov adjustable parts in thelooper actuating mechanism, for adjusting and for initially assembling.

These and other objects will in part be ob vious and will in part behereinafter more' fully disclosed.

In the drawings which show by way of illustration one embodiment 't1on-'V 1926. serial 101,985. I

of the inven in plan'on the line 2-2 of Fig.1, the cover plate and endcap of the arm being removed and parts broken away;

, Fig. 3 is a;detail' in section on the line 3 3 of Fig.2, I v

Fig. 4 is a detail in sectionon the line 44; of Fig.

Fig. 5 is a detailin section on the line 5+5.

of Fig.1; Fig. 6 is a View of a portion of the front of the detachablearm and showingthe uncovered openings through whichaccess may be had 'tocertain of the actuating parts F ig. 7 isa plan view of a cover platefor closing the openings in the work supporting arm. J

Theinvention is directed broadly to a sewing machine having a suspendedwork supa porting arm, and preferably a machineof the: type I shown inthe Patent No. 1,74i1,095,, granted Messrs. Christensen and LeVesconte,December 24, 1929. I 1

The machine of the present application includes a supporting base .orframe, which is provided with an overhanging portionat the upper end towhich the main frame 1 of: the machine is integrally attached. Locatedinthis main. supporting frame is a main actuating shaft 2 which is.driven .by a suit-v able belt'wheel at the opposite end ofthe shaftfromthat shown inFig. 1. This main frame of the machine has an integraldepending portion .3. This depending portion is open at its lower-end.Detachably mounted on the depending portion is a work supportting armA." The work s'upporting'arm closes. the lower. end ofthe dependingportion, and. said arm projects laterally from said depend ing portion,thus forming a suspended substantially cylindrical .work' supporting armon which tubular articles may be stitched and 1 formed. Theworksupporting arm is secured to the depending portion by screws 5.

60 "ings formed integral with .the work sup- In the preferred form ofthe invention, the

material is wrapped around the arm and is fed off from the end of thearm as it is stitched.

work supporting arm. It is mounted adj acent the outer end thereof onsupporting links 8. These links are pivoted to the feed bar at 9 and arealso pivoted at 10 to a lever 12.

The lever 12 is mounted on a fulcrum pin 13.

This fulcrum pin 13 has an eccentric portion on which the lever swingsas a fulcrum, and the pin is capable of being adjusted in differentrsetpositions for raisingorlowering the fulcrum point of the lever. Byraising or lowering the fulcrum point of the lever 12,

the'links 8 are raised or lowered and thus it is that the workingposition of the feed dog is raised or lowered. The feed bar at the rearend thereof is mounted so as to slide on a pin 14. This pin 14 ismounted in the upper end of swinging arms 15 and 16. f These'arms 15 vand 16 are'mounted on an eccentricportion of the pin 17, whichpin ismounted in lugs in the work supporting arm and capable of beingadjustedtherein and set in different ad- 'justed positions. Thiseccentric pin permits the swinging arms tobe'raised or lowered.

This willraise or lower the rear end of the feedbar. Thus it is that thefeed dog may be tilted or leveled as desired. The construction of thefeed bar and the mounting of the same thus far described, is similar tothat shown in our Patent No. 1,763,952, granted June 17, 1930., Theseswingingarms 15 and 16 in the'present embodiment of the invention areprovided with positive means for connecting the same. The hub of the arm15. is provided with radial'grooves 18, while These arms are swungbackand forth on" the hub of the arm 16 isprovided with radial projections19.] These projections fit in the grooves and lock the two armstogether, so that they are bodily oscillated together.

their, pivot pins by means of a link 20. A link 21 is pivoted at 22 tothe feed. bar 6. This link 21 is pivoted at 23 to a lug which isadjustable in a segmental slot 24 formed in the swingingv arm 16. Asnoted above, the feed bar slides back and forth on the pin 14, and thepin 14 can move back and forth in the forked end of the feed bar.

the arm 16, through the link 21, will move the feed bar back and forth.

Also mounted in the work supporting arm is a looper shaft 25. Thislooper shaft 25 is mountedso as to oscillate in suitable bearportingarm. On the forward end of the the reason that two needles 27,27 areshown,

The link 20. oscillates the swinging arms 15 and 16, and

and of course, there is a looper for each ne'edle when makingindependent lines of stitches. The needles are carried by a needle bar28 and the material is held on the work support by a presser foot 29carried by a presser bar 30.. Asnoted above, the feed dog is moved backand forth and up and down,

isoscillated by an oscillation of the looper shaft, and thexlooper ismoved laterally by an endwise movement ofthe looper shaft.

Mounted on the main shaft 2 are two eccentrics 31 and 32. An eccentricstrap 33 cooperates with the eccentric 32 and isconnected to a ball stud34 on the inner end of the lever 12. As the eccentric 32 rotates, it

will, through the eccentric strap 33, oscillatethe lever 12and thusraise and lower the outer end of the feed bar.

Cooperating with the eccentric 31 is an eccentric strap 35.' Thiseccentric strap'at its lower end is connected to a ball stud 36 mountedon an arm 37. The arm 37- is formed integral with a sleeve 38. Thesleeve 38 is mounted on a bearing pin 39 mounted in lugs formed as apart of the detachable work supporting arm 4. When the eccentricrotates, the arm 37 will be raised and lowered through the eccentricstrap connection therewith, and this will oscillate the sleeve 38'. Thesleeve 38 is provided with an upwardly projecting arm 40. Thelink 20 ispivoted at 41 to this upwardly projecting arm. As the sleeve 38 isoscillated, this arm 40, through the link 20, will oscillate the arms 15and 16, and through the link 21, will impart an endwise movement to thefeed bar.

Also mounted on the sleeve 38 is a depend ing arm 42. This depending arm42 is provided with a slot 43. The looper shaft2-5 is provided withspaced collars 44, 44, which are rigidly secured to the looper shaft.Located between these spaced collars is a short sleeve 45 which is looseon the looper shaft so'that theloop'e'r shaft may oscillate in thisshort sleeve 45. The sleeve 45 has a pin 46 projecting radiallytherefrom, and a link 47 is connected to this pin 46. A pin 48 ismounted in the slot 43 of the arm 42, and is capable of being adjustedto diflerent posi tions in said slot, and rigidly clamped in saidpositions. Mounted on this pin 48 is a bearing sleeve 49. The link 47engages this bearing sleeve. As the sleeve 38 oscillates, it will swingthe arm 42 back and forth, and through the link 47, will move the loopershaft endwise. By adjusting the position of the pin 48, the amount ofendwise movement im'part-- ed to the looper shaft may be varied,and

thus the amount of needle avoiding move: ment given to the loopervaried. From the above it will be apparent that the eccentric 31 whichoscillates the sleeve'38 performs two functions. It not only moves thelooper shaft endwise, but it also moves thefeed bar endwise. in the worksupporting arm 4 so as to provide a substantially straight line drivetothe feed bar and to the looper shaft.

On the end of the looper supporting shaft 25 there is a crank carrying aball stud 51 (see Fig. 2). On the end of the main shaft 2 is a collar 52which is fixed to the shaft by a clamping screw. This collar 52 carriesa crank 53 in the form of a ball stud. A link 54 engages the crank 53and also en-. gages the ball stud 51 on the crank .50 attached to theend'of the loopersupporting shaft. As the main shaft rotates, the link54 will be moved endwise, and said link will oscillate the loopersupporting shaft.

It will be noted from the above that we have provided the main shaftwith two eccentrics and a crank, and devices are provided which areactuated thereby for imparting four motions to the feed dog, and fourmotions to the looper. Furthermore, it will be noted that the only partsof the feeding mechanism and the looper mechanism which extend up intothe depending member of theframe are the eccentric rods 33 and 35 andthe link 54. These parts may bereadily disthe work supporting arm 4 maybe readily disconnected from the depending member and removed from themachine. Another arm can be readily substituted for the one taken off,in which a differential feeding mechanism is located, that is,a feedingmechanism not only having a main feed dog, but an auxiliary feed dog. Bythis, substitution, the machine may be quickly changed over to a machinewhich is ready to operate on knit material, so far as the feedingmechanism and looper mechanism are concerned.

The work supporting arm is provided with an opening 56 through which thepin .46 is readily accessible. The work supporting arm is also providedwith an opening'55 through which the pin 41 is readily accessible.

Again, the work supporting'arm is provided with an opening 57 throughwhich the pin 48 is accessible, so that it can be adjusted in the slot43. The work supporting arm is provided with a dove-tailed recess'58. Acover plate 59 is adapted to be inserted in said dove-tailed recess, andcovers all three of the openings 55, 56 and 57. In the right-hand end ofthe work supporting arm, as viewed in Fig. 1, there is an opening 60,which The pin 39 is set sufliciently-low' cilita-tes thev insertionofthe looper supporting shaft in setting up the machine Thisopeningisclosedby a cover plate61.

It is obvious that minor changes in the details of construction and thearrangement of the parts may be made without-departs.

ing .from'the spirit of the. invention as set forth in the appendedclaims.

Ha'vingthus described'the invention, what we claim as new and desire tosecure by Letters-Patent, Is-

1.,A' sewing machine including a main.

frame having a depending member open at its lower'end, a detachable worksupporting arm connected to and closing the lowerend of said dependingmember, a. feed bar extending lengthwise of said work supporting arm,-

a'feed dog carried thereby, a looper shaft extending lengthwise of saidwork supports ingarm, a looper carried thereby, a main arm projectinglaterally fromsaid sleeve, an

eccentric rod cooperating with said second eccentric and connected tosaidarm for. oscillating said sleeve, a second arm'mounted onv saidsleeve, and devices connecting said second arm to said feed bar formoving said feed bar endwise, a third arm mounted on said sleeve, anddevices connected to said third arm and to the looper shaft for movingthe'looper shaftendwise, a crank on said main shaft, and devicesactuated-by said cgazglfi: for oscillatingsaidlooper supporting s a 2; Asewing-machine including a main frame having a depending-member open atits lower end, a detachable pro ecting work supportmg arm connected toand closmgthe lower end of said depending member, a feed- 7 ingmechanism located'in said work supporting arm including a feed dog, alooper mechanism'located'in said work supporting arm I including alooper, a main shaft in said frame extending over said depending member,an

eccentric onsaid main shaft, devices actuated by said eccentric forraising and lowering the feed dogof said feeding mechanism, a second a'3. A sewing machine including a main" frame having a depending'memberopen at its "lower end, adetachable projecting work supporting-armconnected-to and closing the lowerend'of said depending member,affeedextending over said depending member,- an Y eccentric on said mainshaft, devices actuated by said eccentric for raising and lowering thefeed dog of said feeding mechanism, a second eccentric on said mainshaft, devices actuated by said second, eccentric for imparting backandforth movements to the feed dog and for imparting needle avoidingmovements to the looper, a crank on said main shaft, and devicesactuated by said crank for oscillating said looper, all-of the devicesforactuating the feed dog and the looper being mounted for operationin-Lthe work supporting arm, whereby when said devices are disconnectedfrom the eccentrics and the crank on the main shaft, said worksupporting arm may be de-' tached from the machine. 4; A sewing machineincluding a main frame having a depending member open at its lower end,a detachable projecting work supporting arm connected to and closing thelower end of said depending member, a feeding mechanism and a loopermechanism mounted in said work supporting arm, said feeding mechanismincluding a feed bar, and a feed dog carried thereby, said loopermechanism including a looper shaft and a 'looper carried thereby, a pinextending across said I work supporting arm beneath said depending 35member, a sleeve mounted on said pin, a main shaft in the frameextending over said depending member, an eccentric on said main shaft,an eccentric rod cooperating therewith V and connected to said sleevefor oscillating the same, an arm projecting upwardly from said sleeve,devices connected to said arm for moving said feed bar backand forth, anarm projecting downwardly from said sleeve, and devices connected tosaid downwardly projecting arm for moving said looper shaft endwise. 75. A sewing machine including in combination, amain frame having adepending member open at its lower end, a work supporting arm' connectedto .said depending member and adapted to close the lower end thereof, alooper mechanism and a feeding mechanism located in said work supportingarm, driving connections extending from said depending member foractuating said feeding mechanism and said looper mechanism, said worksupporting arm having independent openings inrthe side face thereofthrough which access may be had to certain of the parts of the feedingmechanism and looper mechanism and the devicesfor actuating the same,and a single cover plate for closing said openings.

6. A sewing machine including in combination, a main shaft, alooperhaving an os-" V ifs 59,041

cill'ating and'a 'needle'avoiding movement, a feed dog having an up anddown and a back and forth movement, means for actuating the looper andfeed dog including three eccentric members on said main shaft, anddevices connecting one of said members to the feed dog for raising andlowering the same, devices for connecting a second of said eccentricmembers to the looper for oscillating the same, and devices forconnecting the third eccentric to the feed dog and the looper forsimultaneously imparting back and forth or feeding movements to the feeddog, and needle avoiding movements to the loop-er.

7. A'sewing machine including in combination,a'main frame, having adepending member, a work supporting arm connected to saiddependingmember and suspended thereby, a feeddog in said work supportingarm having an up and down and a back and forth movement, a looper insaid work supporting arm having an oscillating and a needleavoiding'movem-ent, a main shaft in said frame, three eccentric memberson said main shaft, devices for connecting oneof said eccentric membersto the feed dog for raising and lowering the same, devices, connecting asecond eccentric member to the looper for oscillating the same, anddevices connecting the third eccentric member to the looper and the feeddog for simultaneously imparting feeding movements to thefeed dog andneedle avoiding movements to the looper.

8. A sewing machine including a work supporting arm, a feed barextending lengthwise of said arm, a feed dog carried thereby, swingingarms for supporting the inner end of the feed bar, said armshavinginter-engaging parts for rigidly connecting said arms, whereby said armsswing together, a main shaft, a rocking, member oscillated thereby, alink connected to the rocking memberand moved endwise thereby, said linkbeing pivoted to said swinging arms for rocking said arms, and devicesconnecting one of said arms to the feed bar for moving the feed bar backand forth, said arms having a pin for slidingly supporting the feed barwhereby the feed bar'may be given an en'dwise movement relative to saidpin.

In testimony whereof, we affix our signatures.

NORMAN. V. CHRISTENSEN. /VALTER (M. HANNEMAN.

